A man has been arrested on suspicion of murdering a grandfather who was stabbed to death after he was involved in a minor crash on a village road.

Armed officers held the 34-year-old suspect, from Worthing, at 2pm on Friday in connection with the road rage murder of Donald Lock.

Mr Lock, 79, was knifed repeatedly in a "frenzied" attack after he got out of his car following the shunt on the A24 at Findon, near Worthing.

Mr Lock, a long-time member of the Worthing Excelsior Cycling Club, died at the scene at around 8.40pm on Thursday night despite attempts by paramedics to revive him.

The arrest was made less than an hour after Detective Superintendent Adam Hibbert, of the Sussex and Surrey major crime branch, made a televised appeal for the public's help.

At the scene, flowers were placed and tributes were paid to Mr Lock, a married grandfather, as cordons remained in place on the bypass where the killing happened.

John Lucas, who had known Mr Lock for more than 50 years, said: "It's such a terrible thing. He was an unbelievable guy. He would do anything for anyone.

"I can't understand how it happened. He wouldn't have got out of the car and caused any trouble at all.

"He wasn't that type of guy. He has been in the cycling club - Worthing Excelsior Cycling Club - more than 60 years."

A section of the A24 southbound at the junction of Cross Lane, Findon, remains closed. A diversion is in place.

His family revealed this afternoon that Mr Lock had just been given the all-clear from cancer.

A tribute read: "Don has been a keen cyclist since the age of 12 and had been an active member of the Worthing Excelsior Cycling Club since 1960. He was not your typical great grandfather and was still cycling up to 150 miles per week. He still holds the club record for the 24-hour time trial having remained unbeaten for 44 years.

"He was full of energy having recently been given the all clear from cancer. Not only was he passionate about cycling but he had also been supporting Brighton and Hove Albion since the 1940s and was a season ticket holder.

"He loved travelling the world with his wife Maureen and he adored his family. He and Maureen had just celebrated their 55th wedding anniversary.

"Don leaves son Andy, daughter Sandra, four grandchildren, and five great grandchildren with the sixth great grandchild due later this year. Don had lived in Worthing for 55 years and was a popular member of the community.

"He was hugely loved by his family and friends and could often be called upon for his cycling or travel advice. Words cannot describe how much he will be missed."

Anyone with information can contact Sussex Police by ringing 101 or email 101@sussex.pnn.police.uk quoting Operation Wise or call the independent charity Crimestoppers anonymously on 0800 555 111.